Do you mean 1 gallon hand cans?
Or did you mean 200 gallon skid sprayers? If 200, you need separate sprayers for flowers and trees, and a second sprayer for weeds. If you are doing turf without flowers and trees, a slight mixing of chemicals is low risk as long as all the products are registered for turf. Insecticide, fungicide, herbicide for turf--fine. Besides, the excess in the tank is hazardous waste--very difficult to get rid of it legally. You cannot just dump it and rinse out the tank.
Put your Roundup in a 1 gallon hand can. Mark it in big letters. Also put the date of mixing on it--each time. Write on duct tape.

Do you mean 1 gallon hand cans?
Or did you mean 200 gallon skid sprayers? If 200, you need separate sprayers for flowers and trees, and a second sprayer for weeds. If you are doing turf without flowers and trees, a slight mixing of chemicals is low risk as long as all the products are registered for turf. Insecticide, fungicide, herbicide for turf--fine. Besides, the excess in the tank is hazardous waste--very difficult to get rid of it legally. You cannot just dump it and rinse out the tank.
Put your Roundup in a 1 gallon hand can. Mark it in big letters. Also put the date of mixing on it--each time. Write on duct tape.

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I was refering to handheld or backpack. I never considered 1 gallon sprayers. Seems like there would be alot of time spent refilling.

That kinda answers my next question which was if you didn't use seperate sprayers, how do most people get rid of the excess or just dump it back in the container?